Migration process GREEN CARD

Hi, I got married in august and we want to start the green card progress, we had a lawyer but she started another job so now she can’t do it (we never got to talk to her, it was a friend’s friend) so now idk what look on a lawyer since I’ve heard so many stories of people getting scammed.

If you went through this I’d be thankful if you share how you did it, I have no idea on anything, when do you pay for it? Like seriously I’m lost lol